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Have you checked all the connections to be sure there is no corrosion keeping them from making contact? Dip them in full strength CLR. It cleans them up nicely. Make sure all the female ends are crimped down too so they make good contact.



The ignition switch contacts could also give you a problem. Make sure you have good power coming from it.
 

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All the connections under the seat are CDI and stator related. Check, clean and tighten all of them. Also, on the left side above the air cleaner inlet are bullet connectors. The yellow and pink go to the coils. Blk/white goes to the kill switch from the CDI unit. Light green w/red strip is neutral switch. Black & green w/yellow strip is for the rear brake switch. Obviously the coil wires are important to check and clean, but they all should be done as well as any and every connection through out the bike. The other ares to check are all the grounds. Even the base of the coils need to have a good contact with the frames bare metal surface.



Next to the battery, under the starter solenoid is 2 red and 1 white multi plug connections. These are also important to the charging system. Do the same with these as well.



When everything is clean and has proper contact, you have a better chance of isolating, if not eliminating electrical issues.



The other possibility is a broken wire somewhere inside the harness. A multimeter set to continuity test can establish weather you have an open circuit as well as the recommended voltage or resistance for that wire or circuit. A good shop manual will help in that area.



WHen all the connections are cleaned and serviced I use a bit of Di-Electric grease in each connection to keep them from corroding in the future.
 
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